Display panel, manufacturing method of display panel and display device

Abstract

The invention discloses a display panel, a manufacturing method of the display panel and a display device, the display panel comprises a substrate, a light-emitting layer and a first optical structure layer, and the projection of the first optical structure layer on the substrate and the projection of a light-emitting device on the substrate are overlapped. The light-emitting layer comprises a light-emitting device, and the side, away from the substrate, of the light-emitting device is a concave surface, so that the light-emitting device is equivalent to a concave mirror, and light emitted by the light-emitting device is converged light. The side, away from the substrate, of the first optical structure layer is a first protruding surface, so that the first optical structure layer is equivalent to a convex lens, and at the moment, the first optical structure layer can adjust converged light rays emitted by the light-emitting device into small-view-angle light rays to be emitted out, namely, the light rays are emitted out through the small-view-angle light rays. Through mutual cooperation of the light-emitting device with the concave mirror function and the first optical structure layer with the convex lens function, emission of large-view-angle light from the display panel is reduced, emission of small-view-angle light is improved, then peep-proof display is achieved, and information displayed by the electronic equipment is protected.

Description

Technical Field

[0001] The present application relates to the field of display panels, and in particular to a display panel, a method for manufacturing a display panel, and a display device. Background Art

[0002] The current display technology field is mainly divided into liquid crystal display (LCD), organic light emitting display (OLED) and micro light emitting diode (Micro-LED) display. LCD has the advantages of being thin, energy-saving and radiation-free, and is widely used in a variety of electronic devices. Organic light emitting display is based on the recombination of electrons and holes in organic materials to emit light to achieve different colors of display. Organic light emitting is a self-luminous device with the advantages of fast response speed, high brightness, wide viewing angle and low power consumption.

[0003] With the rapid development of display technology, higher requirements are placed on the display of electronic devices. In particular, different application scenarios of electronic devices have different requirements for the display of electronic devices. For example, for more private application scenarios, users want to protect the information displayed by electronic devices. Summary of the invention

[0004] In order to solve the above problems, the present application provides a display panel, a method for manufacturing a display panel, and a display device, which can achieve anti-peeping display and protect the information displayed by the electronic device.

[0005] In a first aspect, the present application provides a display panel, comprising:

[0006] substrate;

[0007] A light-emitting layer is located on one side of the substrate, the light-emitting layer includes a light-emitting device, and a side of the light-emitting device away from the substrate is a concave surface;

[0008] The first optical structure layer is located on the side of the light-emitting layer away from the substrate; the projection of the first optical structure layer on the substrate overlaps with the projection of the light-emitting device on the substrate, and the side of the first optical structure layer away from the substrate is a first convex surface; the first optical structure layer is used to adjust the convergent light emitted by the light-emitting device into a small-viewing angle light emission.

[0009] In a possible implementation manner, along a direction perpendicular to the plane where the substrate is located, a distance between a focus of the light-emitting device and a focus of the first optical structure layer on a side close to the substrate is smaller than a target threshold.

[0010] In a possible implementation, a side of the first optical structure layer close to the substrate is a plane, and along a direction perpendicular to the plane where the substrate is located, a maximum thickness of the first optical structure layer is in a range of [2 μm, 8 μm].

[0011] In a possible implementation manner, a focal point of the light-emitting device coincides with a focal point of the first optical structure layer on a side close to the substrate.

[0012] In a possible implementation manner, a side of the first optical structure layer close to the substrate is a second convex surface, and a convex direction of the second convex surface is opposite to a convex direction of the first convex surface.

[0013] In a possible implementation manner, the second convex surface and the first convex surface are arranged axially symmetrically.

[0014] It also includes a touch layer, which is arranged between the first optical structure layer and the light-emitting layer. The touch layer includes a first groove, the first optical structure layer is arranged in the first groove, and the second convex surface and the first convex surface have an interface between the first optical structure layer and the touch layer as a symmetry axis.

[0015] In a possible implementation manner, a second optical structure layer is further included, wherein the second optical structure layer covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than the refractive index of the second optical structure layer.

[0016] In a possible implementation manner, the concave surface and the first convex surface are arc surfaces.

[0017] In a possible implementation manner, a side of the light emitting device close to the substrate is a concave surface.

[0018] In a possible implementation, a pixel definition layer is further included, wherein the pixel definition layer includes a pixel opening corresponding to the light-emitting device, and a projection of the light-emitting device on the pixel definition layer is located within the pixel opening.

[0019] In a possible implementation, the minimum boundary distance range between the projection of the first optical structure layer on the pixel definition layer and the pixel opening is [-0.5μm, 2μm], and the minimum boundary distance takes the direction of the light-emitting device toward the pixel definition layer and parallel to the surface of the substrate as the positive direction.

[0020] In a possible implementation, a light-exit blocking layer is further included, wherein the light-exit blocking layer includes a light-exit opening, and the light-exit blocking layer is used to block the emission of light with a large viewing angle.

[0021] In a possible implementation, a pixel definition layer is further included, wherein the pixel definition layer includes a pixel opening corresponding to the light emitting device, and a projection size of the light exit opening on the pixel definition layer is larger than a size of the pixel opening.

[0022] In a possible implementation manner, a planarization layer is further included, the planarization layer includes a plurality of second grooves, and the light emitting device is disposed in the second grooves.

[0023] In the present application, the display panel reduces the emission of large-viewing angle light from the display panel and increases the emission of small-viewing angle light through the cooperation of a light-emitting device with a concave mirror function and a first optical structure layer with a convex lens function, and by setting a light-blocking layer, thereby achieving anti-peeping display and protecting the information displayed by the electronic device.

[0024] In a second aspect, the present application provides a method for manufacturing a display panel, comprising:

[0025] forming a planarization layer on the substrate;

[0026] Performing photolithography on the planarization layer using a semi-transparent mask to obtain a plurality of second grooves;

[0027] forming a light-emitting layer, wherein the light-emitting layer includes a light-emitting device, wherein the light-emitting device is disposed in the second groove, and a side of the light-emitting device away from the substrate is a concave surface;

[0028] A first optical structure layer is formed on a side of the light-emitting layer away from the substrate by using a photolithography process, wherein a projection of the first optical structure layer on the substrate overlaps with a projection of the light-emitting device on the substrate, and a side of the first optical structure layer away from the substrate is a first convex surface; the first optical structure layer is used to adjust the convergent light emitted by the light-emitting device into a small-viewing angle light emission.

[0029] In a possible implementation, the method further includes:

[0030] forming a touch layer on a side of the light-emitting layer away from the substrate;

[0031] Performing photolithography on the touch layer using a semi-transparent mask to obtain a plurality of first grooves;

[0032] The forming of a first optical structure layer on a side of the light-emitting layer away from the substrate by using a photolithography process comprises:

[0033] A high-refractive film layer is formed, the high-refractive film layer fills the first groove and covers the touch layer, and the high-refractive film layer is etched by a photolithography process to form a first optical structure layer on a side of the touch layer away from the substrate, the first optical structure layer is arranged in the first groove, and a side of the first optical structure layer close to the substrate is a second convex surface, and a convex direction of the second convex surface is opposite to that of the first convex surface.

[0034] In a possible implementation, the method further includes:

[0035] A second optical structure layer is formed, wherein the second optical structure layer covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than the refractive index of the second optical structure layer.

[0036] In a possible implementation, the method further includes:

[0037] A light-emitting blocking layer is formed, and the light-emitting blocking layer is etched to form a light-emitting opening.

[0038] In the present application, the first groove and the second groove are formed by using a semi-transparent mask, and the manufacturing process is simple.

[0039] In a third aspect, the present application provides a display device, which includes the display panel described above.

[0040] The present application provides a display panel, which includes a substrate, a light-emitting layer and a first optical structure layer. The light-emitting layer is located on one side of the substrate, and the first optical structure layer is located on the side of the light-emitting layer away from the substrate. The projection of the first optical structure layer on the substrate overlaps with the projection of the light-emitting device on the substrate, that is, the light is emitted from the light-emitting layer and then passes through the first optical structure layer. The light-emitting layer includes a light-emitting device, and the light-emitting device is used to emit light. The side of the light-emitting device away from the substrate is a concave surface, so that the light-emitting device is equivalent to a concave mirror, and the focus of the concave mirror is located on the side of the light-emitting layer facing the first optical structure layer, so that the light emitted by the light-emitting device is a convergent light. The side of the first optical structure layer away from the substrate is a first convex surface, so that the first optical structure layer is equivalent to a convex lens, and the focus of the convex lens is located on the side of the first optical structure layer facing the light-emitting layer. At this time, the first optical structure layer can adjust the convergent light emitted by the light-emitting device to a small viewing angle light. That is to say, through the cooperation of the light-emitting device with a concave mirror function and the first optical structure layer with a convex lens function, the large viewing angle light emitted from the display panel is reduced, and the small viewing angle light is increased, thereby realizing anti-peeping display and protecting the information displayed by the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a schematic diagram of a viewing angle of a display panel;

[0042] Figure 2 A schematic diagram of a top view structure of a display panel provided in an embodiment of the present application;

[0043] Figure 3 The present application embodiment is shown along Figure 2 A schematic diagram of the cross-sectional structure in the BB direction is shown;

[0044] Figure 4 A schematic diagram of a cross-sectional structure of another display panel provided in an embodiment of the present application is shown;

[0045] Figure 5 A schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present application is shown;

[0046] Figure 6 A schematic cross-sectional structure diagram of another display panel provided in an embodiment of the present application is shown;

[0047] Figure 7 A schematic diagram showing a process of a method for manufacturing a display panel provided in an embodiment of the present application is shown;

[0048] Figure 8 A schematic diagram of the top view of the structure of a display device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0051] Secondly, the present application is described in detail with reference to the schematic diagram. When describing the embodiments of the present application in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present application. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0052] In practical applications, when light is emitted from the display panel, it includes large viewing angle light and small viewing angle light, and large viewing angle light and small viewing angle light are defined based on the positive viewing angle. The positive viewing angle of the display panel means that when the user looks at the display panel, the user's line of sight is perpendicular to the display panel, or the angle between the user's line of sight and the direction perpendicular to the display panel does not exceed 5°. As shown in reference figure 1, it can be seen from the figure that the user's line of sight is perpendicular to the display panel, or the angle between the user's line of sight and the direction perpendicular to the display panel does not exceed 5°. Small viewing angle light refers to the angle range between the light emitted from the display panel and the direction perpendicular to the display panel of 0-50°. Large viewing angle light refers to the angle range between the light emitted from the display panel and the direction perpendicular to the display panel of 50°-90°. Usually, the demand for anti-peeping display is to reduce large viewing angle light and increase small viewing angle light. The optimal situation is that except for the light emitted from the display panel at the positive viewing angle, the light emitted from the display panel cannot be seen at other viewing angles.

[0053] Currently, anti-peeping display can be achieved by setting a louver array film (LAF) in the display panel of the electronic device. However, the louver array film includes multiple film layers such as a louver structure, a protective layer and an adhesive material. The thickness of the louver array film is usually thicker, ranging from 200um to 400um, so it cannot meet the thinning requirements of electronic devices or display panels. In other words, the current louver array film cannot be applied to thin products, such as organic light-emitting display panels.

[0054] The louver structure in the louver array film mainly plays the role of controlling the viewing angle, thereby achieving anti-peeping display. The thickness of the louver structure is only 100um, but the louver structure has the characteristics of complex structure. The current process cannot directly apply a single louver structure to a thin product.

[0055] Based on this, the present application provides a display panel, which reduces the light emitted from the display panel at a large viewing angle and increases the light emitted from a small viewing angle through the cooperation of a light-emitting device having a concave mirror function and a first optical structure layer having a convex lens function, thereby realizing anti-peeping display and protecting the information displayed by the electronic device. In this way, anti-peeping display can be realized without setting up a thicker shutter array film and can adapt to thin products.

[0056] In order to better understand the technical solution and technical effects of the present application, specific embodiments will be described in detail below with reference to the accompanying drawings.

[0057] refer to Figure 2 , which is a schematic diagram of a top view structure of a display panel provided in an embodiment of the present application. Figure 3 is along Figure 2Schematic diagram of the cross-sectional structure of the display panel taken along the direction of BB.

[0058] The display panel 100 provided in the embodiment of the present application may be a rigid display panel or a flexible display panel. The rigid display panel is hard and not easy to bend or fold, and the flexible display panel is flexible and can be easily bent, folded or curled. For example, the display panel 100 is a foldable display panel that can be folded and unfolded, a curved display panel with a curved display surface, a curved display panel with an area other than the curved display surface, a rollable display panel that can be rolled and / or unfolded, a stretchable display panel that can be stretched and / or not stretched, etc.

[0059] refer to Figure 2 As shown, the display panel 100 provided in the embodiment of the present application includes a display area AA and a non-display area NA, and the non-display area NA surrounds the display area AA. The display area AA is an area for display, and the non-display area NA is an area for setting a circuit structure for driving the display panel 100 to display. The display area AA may occupy most of the area of ​​the display panel 100, and the display area AA may be set at the center of the display panel 100, such as the central area, and the non-display area NA is an area outside the display area AA, and the non-display area NA may be defined as an edge area of ​​the display panel 100, such as the peripheral area.

[0060] In some embodiments, the non-display area NA includes a first non-display area NA1 and a second non-display area NA2. The display area AA surrounds the first non-display area NA1. The first non-display area NA1 can be a camera area for setting a camera area. The second non-display area NA2 can be a frame area, for example.

[0061] The display panel 100 provided in the embodiment of the present application includes a substrate 110. The substrate 110 may include an insulating material (for example, may be made of an insulating material), and the insulating material may be glass, quartz, or a polymer resin. The substrate 110 may be a flexible substrate that can be bent, folded, and / or rolled. As an example, the substrate 110 may include polyimide.

[0062] In one embodiment, the substrate 110 may include a first substrate, a second substrate and an inorganic barrier layer. Each of the first substrate and the second substrate may include a polymer resin, such as at least one of polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate or cellulose acetate propionate. And the first substrate and the second substrate may include the same material or different materials. The substrate 110 adopts a structure including a polymer resin and an inorganic barrier layer to enable the display panel to be bent, folded and / or curled. And it can enhance the flatness and temperature stability of the substrate 110, facilitate the subsequent production of other film layers on its surface and enable it to withstand subsequent processing technology, and at the same time, further reduce the risk of film layer shedding during the bending process of the display panel and block the influence of movable charges on the thin film transistor channel, thereby improving the display quality.

[0063] The display panel 100 provided in the embodiment of the present application includes a light-emitting layer, which is arranged on one side of the substrate 110. The light-emitting layer includes at least one light-emitting device 120, and the light-emitting device 120 can be a semiconductor device capable of emitting light of different colors, and different light-emitting colors correspond to different light-emitting wavelengths. For example, the light-emitting device 120 can be a red light-emitting device capable of emitting red light, a green light-emitting device capable of emitting green light, and a blue light-emitting device capable of emitting blue light. Exemplarily, the embodiment of the present application can select an organic light-emitting diode (OLED) as the light-emitting device, or the embodiment of the present application can also set the light-emitting device to a quantum dot light-emitting diode (QLED).

[0064] In the embodiment of the present application, the side of the light emitting device 120 away from the substrate 110 may be a concave surface, referring to Figure 3 As shown, the concave direction of the concave surface is toward the substrate 110, that is, the distance between the side of the light-emitting device 120 away from the substrate 110 and the substrate 110 shows a trend of gradually decreasing and then gradually increasing, so that the light-emitting device 120 is equivalent to a concave mirror, and the focus of the concave mirror is located on the side of the light-emitting layer away from the substrate 110, so that the light emitted by the light-emitting device 120 is convergent light.

[0065] The shape of the side of the light emitting device 120 close to the substrate 110 does not affect the light emitted by the light emitting device 120 to be convergent light.

[0066] In one embodiment, a side of the light emitting device 120 close to the substrate 110 may be a plane parallel to the plane where the substrate 110 is located.

[0067] In another embodiment, the side of the light emitting device 120 close to the substrate 110 may also be a concave surface, that is, both sides of the light emitting device 120 are concave surfaces, and the concave directions are both toward the substrate 110. The structure in which both sides of the light emitting device 120 are concave surfaces is relatively easy to manufacture.

[0068] In some embodiments, the light emitting device 120 may include an anode metal layer 121, an organic light emitting layer 122, and a cathode metal layer (not shown). The organic light emitting layer 122 is used to emit light of different colors.

[0069] It is understandable that the light emitting device 120 includes, in addition to the anode metal layer 121, the organic light emitting layer 122, and the cathode metal layer, it may also include a common layer of organic materials, such as a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer.

[0070] When actually manufacturing multiple film layers of the light emitting device 120 , the curvature control of different film layers is specifically designed according to the actual light emission conditions.

[0071] The display panel 100 provided in the embodiment of the present application includes a first optical structure layer 130, which is located on the side of the light-emitting layer away from the substrate 110. The projection of the first optical structure layer 130 on the substrate 110 overlaps with the projection of the light-emitting device 120 on the substrate 110, so that the light emitted from the light-emitting layer passes through the first optical structure layer 130 and then exits. The overlap of the projection of the first optical structure layer 130 on the substrate 110 and the projection of the light-emitting device 120 on the substrate 110 refers to the overlap of the orthographic projection.

[0072] In an embodiment of the present application, a side of the first optical structure layer 130 away from the substrate 110 is a first convex surface, and the convex direction of the first convex surface is a direction away from the substrate 110, that is, the distance between the side of the first optical structure layer 130 away from the substrate 110 and the substrate 110 shows a trend of gradually increasing from small to large and then gradually decreasing, so that the first optical structure layer 130 is equivalent to a convex lens, and the focus of the convex lens is located on the side of the first optical structure layer 130 facing the light-emitting layer. According to the characteristic of the convex lens that the convergent light can be adjusted to parallel light, the first optical structure layer 130 can adjust the convergent light emitted by the light-emitting device 120 to a small-angle light emission.

[0073] That is to say, through the cooperation between the light emitting device 120 with concave mirror function and the first optical structure layer 130 with convex lens function, the large-angle light emitted from the display panel can be reduced and the small-angle light emission can be increased, thereby achieving anti-peeping display and protecting the information displayed by the electronic device.

[0074] In the embodiment of the present application, in order to achieve the first optical structure layer 130 to adjust the convergent light emitted by the light emitting device 120 to a small viewing angle light emission, the focus of the light emitting device 120 and the focus of the first optical structure layer 130 cannot be too far apart, otherwise the light adjustment may not be achieved. Since the first optical structure layer 130 has the function of a convex lens, it has two focal points. The focus referred to in the embodiment of the present application is the focus of the first optical structure layer 130 close to the substrate 110.

[0075] In some embodiments, along a direction perpendicular to the plane where the substrate 110 is located, the distance between the focus of the light emitting device 120 and the focus of the first optical structure layer 130 on the side close to the substrate 110 is less than a target threshold. The target threshold is determined according to the curvature of the light emitting device 120 and the first optical structure layer 130.

[0076] In one embodiment, the focus of the light-emitting device 120 coincides with the focus of the first optical structure layer 130 on the side close to the substrate 120, so that the convergent light emitted by the light-emitting device 120 converges at the focus of the light-emitting device 120, and then the convergent light is also at the focus of the first optical structure layer 130, and is directly adjusted by the first optical structure layer 130 to be parallel light. In this way, all the light emitted by the light-emitting device 120 is emitted as small-angle light, which greatly improves the emission of small-angle light and reduces the emission of large-angle light, thereby achieving a better anti-peeping effect.

[0077] In some embodiments, the shape of the first optical structure layer 130 close to the substrate 110 does not affect the convex lens characteristics of the first optical structure layer 130 .

[0078] In one embodiment, the side of the first optical structure layer 130 close to the substrate 110 may be a plane parallel to the plane where the substrate 110 is located, so that the first optical structure layer 130 constitutes a plano-convex lens. In this case, the first optical structure layer 130 is relatively easy to manufacture.

[0079] As an example, along the direction perpendicular to the plane where the substrate 110 is located, the maximum thickness of the first optical structure layer 130 is in the range of [2μm, 8μm], that is, the maximum distance between the first optical structure layer 130 and the film layer thereunder varies between 2μm and 8μm, providing more structural design scenarios for the first optical structure layer 130. In this way, after obtaining the maximum length of the first optical structure layer 130 parallel to the plane where the substrate 110 is located, the curvature of the first optical structure layer 130 can be obtained.

[0080] In another embodiment, the side of the first optical structure layer 130 close to the substrate 110 is a second convex surface, and the convex direction of the second convex surface is opposite to the convex direction of the first convex surface, that is, the convex direction of the second convex surface is close to the substrate 110, so that the first optical structure layer 130 constitutes a double convex lens.

[0081] It should be noted that the first convex surface and the second convex surface can be arranged axially symmetrically or asymmetrically, and the first optical structure 130 obtained by the axially symmetrical arrangement has the best anti-peeping effect. Compared with the first optical structure layer 130 of the plano-convex lens, the first optical structure layer 130 of the biconvex lens can reduce imaging aberrations and has a shorter focal length. At the same focal length, the first optical structure layer 130 of the biconvex lens has a larger radius of curvature, and accordingly, the first optical structure layer 130 of the biconvex lens is larger in size, has a larger luminous flux, and has a higher imaging quality.

[0082] In some embodiments, the concave surface, the first convex surface, and the second convex surface are arc surfaces, which can achieve a clearer focus and thus improve the control of the direction of light.

[0083] The display panel 100 provided in the embodiment of the present application may further include a driving circuit layer (not shown), a planarization layer 140, a pixel definition layer 150, an encapsulation layer 160, a touch layer 170 and a second optical structure layer 180, wherein the planarization layer 140, the light-emitting layer, the pixel definition layer 150, the encapsulation layer 160, the touch layer 170, the first optical structure layer 130 and the second optical structure layer 180 are stacked in sequence.

[0084] A plurality of driving transistors may be provided in the driving circuit layer. The driving circuit layer includes an active layer, a first metal layer, a second metal layer, and an insulating layer between adjacent conductive layers, such as a buffer layer, a gate insulating layer, a first interlayer insulating layer, and a second interlayer insulating layer. The driving circuit layer may also include a third metal layer and a fourth metal layer and an insulating layer therebetween, which are not shown in the figure. Specifically, the channel of the driving transistor is located in the active layer, the gate of the driving transistor is located in the first metal layer, and the source electrode and the drain electrode of the driving transistor are located in the second metal layer.

[0085] The planarization layer 140 covers the driving circuit layer and is used to provide a flat surface for arranging the light emitting device 120. The planarization layer 140 can be an organic material, such as acrylic, benzocyclobutene, hexamethyldisiloxane, or a combination thereof. The planarization layer 140 includes a plurality of second grooves, and the light emitting device 120 is arranged in the second grooves. The shape of the second groove is determined according to the shape of the side of the light emitting device 120 close to the substrate 110.

[0086] In one embodiment, the side of the light-emitting device 120 close to the substrate 110 is a plane parallel to the plane where the substrate 110 is located. In this case, the bottom of the second groove can be set to a plane parallel to the plane where the substrate 110 is located, so that the light-emitting device 120 can be set in the second groove.

[0087] In another embodiment, the side of the light emitting device 120 close to the substrate 110 is a concave surface, and the bottom of the second groove can also be set to a concave surface facing the substrate 110, so that the light emitting device 120 can be set in the second groove. The second groove with a concave surface can be obtained by photolithography using a half-tone mask. Among them, the use of a half-tone mask for photolithography is to reduce the light transmittance of the opening of the mask to reduce the exposure received by the photoresist, thereby achieving etching of different heights.

[0088] The thickness of the planarization layer 140 may be relatively thick, for example, 2.8 μm, which can reduce the coupling capacitance between the data wiring and the anode metal layer 121 or the cathode metal layer on one hand, and provide enough space to form the second groove on the other hand.

[0089] It should be noted that in Figure 3 The planarization layer 140 is illustrated as a single layer, but in other embodiments, the planarization layer 140 may have a multi-layer structure.

[0090] The pixel definition layer 150 is disposed on the surface of the planarization layer 140. The pixel definition layer 150 has a plurality of pixel openings. The pixel openings expose the light emitting devices 120 corresponding to the pixel openings, that is, the light emitting devices 120 and the pixel openings may correspond one to one, and the projection of the light emitting devices 120 on the pixel definition layer 150 is located within the pixel openings.

[0091] In some embodiments, the length of the pixel opening and the length of the first optical structure layer 130 are correlated. The direction from the light emitting device 120 toward the pixel definition layer 150 and parallel to the surface of the substrate 110 is the positive direction, that is, the direction from the display area AA to the non-display area NA is the positive direction, and the direction from the non-display area NA to the display area AA is the reverse direction. The minimum boundary distance between the projection of the first optical structure layer 130 on the pixel definition layer 150 and the same side of the pixel opening is S, and the range of S is [-0.5μm, 2μm]. In other words, the length of the first optical structure layer 130 can be greater than the length of the pixel opening, and the difference between the lengths of the two is the sum of the minimum boundary distances on both sides, then the length of the first optical structure layer 130 can be greater than the length of the pixel opening by up to 4μm. Accordingly, the length of the first optical structure layer 130 can be less than the length of the pixel opening, and the difference between the lengths of the two is the sum of the minimum boundary distances on both sides, then the length of the first optical structure layer 130 can be less than the length of the pixel opening by up to 1μm.

[0092] The encapsulation layer 160 includes at least one inorganic encapsulation layer and at least one organic encapsulation layer. Figure 3 The encapsulation layer 160 shown in the figure includes a first inorganic encapsulation layer 161, a second inorganic encapsulation layer 163, and an organic encapsulation layer 162 disposed between the first inorganic encapsulation layer 161 and the second inorganic encapsulation layer 163. The first inorganic encapsulation layer 161 and the second inorganic encapsulation layer 163 may include at least one inorganic material such as aluminum oxide, titanium oxide, tantalum oxide, hafnium oxide, zinc oxide, silicon oxide, silicon nitride, and silicon oxynitride. The organic encapsulation layer 162 may include a monomer organic material or a polymer material (i.e., an organic encapsulation material). Examples of polymer materials may include acrylic resins, epoxy resins, polyimides, and polyethylene. The encapsulation layer 160 is used to protect the light-emitting device 120 or the driving transistor thereunder from being affected by water vapor or oxygen in the air.

[0093] The touch layer 170 is located on a side of the encapsulation layer 160 away from the substrate 110. The touch layer 170 includes a touch insulating layer and a touch electrode. The touch electrode can be arranged in the touch insulating layer to receive a touch signal from a user. The touch electrode includes a first touch electrode and a second touch electrode. When the first touch electrode is a sensing electrode, the second touch electrode is a driving electrode. When the first touch electrode is a driving electrode, the second touch electrode is a sensing electrode. Touch detection based on the mutual capacitance principle is realized by the first touch electrode and the second touch electrode. The touch electrode can be made of a material with good conductive properties, including a single layer or multiple layers of any one or more (for example, made of any one or more) of metal materials such as molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu) and alloys thereof.

[0094] In some embodiments, the shape of the touch layer 170 away from the substrate 110 is determined according to the shape of the first optical structure layer 130 close to the substrate 110 .

[0095] In one embodiment, the side of the first optical structure layer 130 close to the substrate 110 is a plane parallel to the plane where the substrate 110 is located, and the side of the touch layer 170 away from the substrate 110 is also a plane parallel to the plane where the substrate 110 is located. Figure 3 shown.

[0096] In another embodiment, the side of the first optical structure layer 130 close to the substrate 110 is a second convex surface, and the touch layer 170 includes at least one first groove, the first optical structure layer 130 is arranged in the first groove, and the shape of the first groove is determined according to the shape of the side of the first optical structure layer 130 close to the substrate 110. In other words, the bottom of the first groove is a concave surface, and the concave direction of the concave surface is the same as the convex direction of the second convex surface, so that the first optical structure layer 130 can be arranged in the first groove, and the first groove with a concave surface can be obtained by photolithography using a half-tone mask.

[0097] As an example, the second convex surface and the first convex surface are arranged axially symmetrically, and the symmetry axis between the second convex surface and the first convex surface is the interface between the first optical structure layer 130 and the touch layer 170, referring to Figure 4 shown.

[0098] The second optical structure layer 180 covers the first optical structure layer 130. The refractive index of the first optical structure layer 130 is greater than the refractive index of the second optical structure layer 180, so that the light emitted by the light emitting device 120 continues to be emitted through the second optical structure layer 180 after being refracted by the first optical structure layer 130, that is, the light emission with a small viewing angle can be continued by utilizing the refraction between the first optical structure layer 130 and the second optical structure layer 180. The thickness range of the second optical structure layer 180 is [8μm, 20μm]. The second optical structure layer 180 can be formed by an inkjet printing process.

[0099] As an example, the refractive index of the first optical structure layer 130 may be in a range of 1.56-1.8, and the refractive index of the second optical structure layer 180 may be in a range of 1.4-1.55.

[0100] The display panel 100 provided in the embodiment of the present application may further include a light-exit blocking layer 190, Figure 5 and Figure 6 As shown. The light exit blocking layer 190 includes a light exit opening, the light exit opening is used for the light of small viewing angle to exit, and the light exit blocking layer 190 is used to block the light of large viewing angle to exit. The light exit blocking layer 190 can be a black matrix.

[0101] As an example, the thickness of the light blocking layer 190 may be in the range of [0.5 μm, 5 μm], and the slope angle of the light blocking layer 190 may be in the range of [30°, 85°], where the slope angle refers to the angle between the side wall of the light blocking layer 190 and the surface of the second optical structure layer 180 .

[0102] In some embodiments, the projected size of the light exit opening on the pixel definition layer 150 is greater than or equal to the size of the pixel opening, thereby preventing the small viewing angle light from being blocked by the light exit blocking layer 190 .

[0103] The display panel 100 provided in the embodiment of the present application may further include an optical adhesive layer 191, referring to Figure 5 As shown, the optical adhesive layer 191 is used to cover the light exit blocking layer 190 to achieve planarization. The thickness of the optical adhesive layer 191 can be in the range of [2 μm, 6 μm].

[0104] The display panel 100 provided in the embodiment of the present application may further include other film layers, such as a polarizer or a glass cover.

[0105] It can be seen that the display panel provided in the embodiment of the present application reduces the emission of large-angle light from the display panel and increases the emission of small-angle light through the cooperation of the light-emitting device with a concave mirror function and the first optical structure layer with a convex lens function, and by setting a light-blocking layer, thereby achieving anti-peeping display and protecting the information displayed by the electronic device.

[0106] Based on a display panel provided in the above embodiment, an embodiment of the present application further provides a method for manufacturing a display panel, and the manufacturing method will be described in detail below with reference to the accompanying drawings.

[0107] refer to Figure 7 As shown, the manufacturing method of the display panel provided in the embodiment of the present application includes the following steps:

[0108] S101, forming a planarization layer on a substrate.

[0109] In the embodiment of the present application, a driving circuit layer and a planarization layer may be formed sequentially on the substrate, and the material of the planarization layer may be

[0110] S102, photolithography is performed on the planarization layer using a semi-transparent mask to obtain a plurality of second grooves.

[0111] In an embodiment of the present application, a plurality of second grooves are obtained by photolithography of the planarization layer. The bottom of the second groove may be a concave surface. To achieve the concave surface, a semi-transparent mask may be used to photolithography the planarization layer. The photolithography process of obtaining the plurality of second grooves using a semi-transparent mask is relatively simple.

[0112] There is no need to add additional process steps when etching with a semi-transparent mask. The original process steps can be replaced with the semi-transparent mask etching process steps. This allows the display panel to be manufactured in a relatively simple manner without increasing costs.

[0113] S103, forming a light-emitting layer.

[0114] In the embodiment of the present application, after the second groove with the concave surface is obtained, a light-emitting layer can be formed, the light-emitting layer includes a light-emitting device, and the light-emitting device is arranged in the second groove, and the side of the light-emitting device away from the substrate is a concave surface. The light-emitting layer can be formed by an evaporation process.

[0115] S104, forming a first optical structure layer on a side of the light-emitting layer away from the substrate by using a photolithography process.

[0116] In an embodiment of the present application, a pixel definition layer, an encapsulation layer, and a touch layer are sequentially formed on the light-emitting layer, and then a first optical structure layer is formed on the touch layer. Specifically, the first optical structure layer can be formed by a photolithography process. The pixel definition layer has a plurality of pixel openings. The pixel openings expose the light-emitting devices corresponding to the pixel openings, that is, the light-emitting devices and the pixel openings can correspond one to one, and the projection of the light-emitting devices on the pixel definition layer is located within the pixel openings.

[0117] The projection of the first optical structure layer on the substrate overlaps with the projection of the light emitting device on the substrate, so that the first optical structure layer can be used to adjust the convergent light emitted by the light emitting device to be emitted with a small viewing angle.

[0118] In one embodiment, the side of the first optical structure layer close to the substrate is a plane parallel to the plane where the substrate is located, and a high-refractive film layer is directly formed on the touch layer, and then the high-refractive film layer is etched using a photolithography process to obtain the first optical structure layer.

[0119] In another embodiment, the side of the first optical structure layer close to the substrate is a second convex surface, and the touch layer can be photolithographically processed using a semi-transparent mask to obtain a plurality of first grooves, and a high-refractive film layer is formed on the surface of the first groove and the touch layer, that is, the high-refractive film layer fills the first groove and covers the touch layer, and the high-refractive film layer is etched using a photolithography process, so that the first optical structure layer is formed on the side of the touch layer away from the substrate. At this time, the first optical structure layer is arranged in the first groove. Since the bottom of the first groove is a concave surface, the side of the first optical structure layer close to the substrate is a second convex surface, and the convex direction of the second convex surface is the same as the concave direction of the concave surface of the first groove. The first optical structure layer also includes a first convex surface on the side away from the substrate, and the convex direction of the second convex surface is opposite to the convex direction of the first convex surface.

[0120] In the embodiment of the present application, a second optical structure layer may be formed on the surface of the first optical structure layer, the second optical structure layer covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than the refractive index of the second optical structure layer.

[0121] In the embodiment of the present application, a light-exit blocking layer may be formed, and the light-exit blocking layer may be etched to form a light-exit opening so that small-viewing angle light can be emitted, and the light-exit blocking layer may be used to block the emission of large-viewing angle light.

[0122] An embodiment of the present application also provides a display device, comprising the display panel described in the above embodiment.

[0123] refer to Figure 8 , which is a schematic diagram of the planar structure of a display device provided in an embodiment of the present application. As can be seen from the figure, the display device 1000 includes a display panel 100, and the display panel 100 is the display panel 100 described in any of the above embodiments. The display device 1000 provided in the embodiment of the present application may be a mobile phone, a computer, a television, a car display device or other display device with a display function, and the embodiment of the present application does not make specific limitations. The display device 1000 provided in the embodiment of the present application has the beneficial effects of the display panel 100 provided in the embodiment of the present application. For details, please refer to the specific description of the display panel in the above embodiment, and the embodiment of the present application will not be repeated here.

[0124] It should be understood that in this application, "at least one (item)" means one or more, and "more than one" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist, where A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0125] As used herein, the term "including" and its variations are open-ended, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments".

[0126] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized in that: include: substrate; A light-emitting layer is located on one side of the substrate, the light-emitting layer includes a light-emitting device, and a side of the light-emitting device away from the substrate is a concave surface; A first optical structure layer is located on a side of the light-emitting layer away from the substrate; The projection of the first optical structure layer on the substrate overlaps with the projection of the light-emitting device on the substrate, and a side of the first optical structure layer away from the substrate is a first convex surface; The first optical structure layer is used to adjust the convergent light emitted by the light emitting device into a small viewing angle light.

2. The display panel according to claim 1, characterized in that: Along a direction perpendicular to the plane where the substrate is located, a distance between a focus of the light-emitting device and a focus of the first optical structure layer on a side close to the substrate is smaller than a target threshold.

3. The display panel according to claim 2, characterized in that: The side of the first optical structure layer close to the substrate is a plane, and along a direction perpendicular to the plane where the substrate is located, the maximum thickness of the first optical structure layer is in the range of [2 μm, 8 μm].

4. The display panel according to claim 2, characterized in that: The focal point of the light emitting device coincides with the focal point of the first optical structure layer on a side close to the substrate.

5. The display panel according to claim 1, characterized in that: A side of the first optical structure layer close to the substrate is a second convex surface, and a convex direction of the second convex surface is opposite to that of the first convex surface.

6. The display panel according to claim 5, characterized in that: The second convex surface and the first convex surface are arranged in an axisymmetric manner.

7. The display panel according to claim 6, characterized in that: It also includes a touch layer, which is arranged between the first optical structure layer and the light-emitting layer. The touch layer includes a first groove, the first optical structure layer is arranged in the first groove, and the second convex surface and the first convex surface have an interface between the first optical structure layer and the touch layer as a symmetry axis.

8. The display panel according to any one of claims 1 to 7, characterized in that: The optical structure layer further includes a second optical structure layer, wherein the second optical structure layer covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than the refractive index of the second optical structure layer.

9. The display panel according to any one of claims 1 to 7, characterized in that: The concave surface and the first convex surface are arc surfaces.

10. The display panel according to any one of claims 1 to 7, characterized in that: A side of the light emitting device close to the substrate is a concave surface.

11. The display panel according to any one of claims 1 to 7, characterized in that: It also includes a pixel definition layer, which includes a pixel opening corresponding to the light-emitting device, and the projection of the light-emitting device on the pixel definition layer is located in the pixel opening.

12. The display panel according to claim 11, characterized in that: The minimum boundary distance range between the projection of the first optical structure layer on the pixel definition layer and the pixel opening is [-0.5μm, 2μm], and the minimum boundary distance takes the direction of the light-emitting device toward the pixel definition layer and parallel to the surface of the substrate as the positive direction.

13. The display panel according to any one of claims 1 to 7, characterized in that: It also includes a light-exit blocking layer, which includes a light-exit opening and is used to block the emission of light with a large viewing angle.

14. The display panel according to claim 13, characterized in that: It also includes a pixel definition layer, which includes a pixel opening corresponding to the light-emitting device, and the projection size of the light-emitting opening on the pixel definition layer is larger than the size of the pixel opening.

15. The display panel according to any one of claims 1 to 7, characterized in that: The device further comprises a planarization layer, wherein the planarization layer comprises a plurality of second grooves, and the light emitting device is disposed in the second grooves.

16. A method for manufacturing a display panel, characterized in that: include: forming a planarization layer on the substrate; Performing photolithography on the planarization layer using a semi-transparent mask to obtain a plurality of second grooves; forming a light-emitting layer, wherein the light-emitting layer includes a light-emitting device, wherein the light-emitting device is disposed in the second groove, and a side of the light-emitting device away from the substrate is a concave surface; Forming a first optical structure layer on a side of the light-emitting layer away from the substrate by using a photolithography process, wherein a projection of the first optical structure layer on the substrate overlaps with a projection of the light-emitting device on the substrate, and a side of the first optical structure layer away from the substrate is a first convex surface; The first optical structure layer is used to adjust the convergent light emitted by the light emitting device into a small viewing angle light.

17. The method according to claim 16, characterized in that The method further comprises: forming a touch layer on a side of the light-emitting layer away from the substrate; Performing photolithography on the touch layer using a semi-transparent mask to obtain a plurality of first grooves; The forming of a first optical structure layer on a side of the light-emitting layer away from the substrate by using a photolithography process comprises: A high-refractive film layer is formed, the high-refractive film layer fills the first groove and covers the touch layer, and the high-refractive film layer is etched by a photolithography process to form a first optical structure layer on a side of the touch layer away from the substrate, the first optical structure layer is arranged in the first groove, and a side of the first optical structure layer close to the substrate is a second convex surface, and a convex direction of the second convex surface is opposite to that of the first convex surface.

18. The method according to claim 16 or 17, characterized in that The method further comprises: A second optical structure layer is formed, wherein the second optical structure layer covers the first optical structure layer, and the refractive index of the first optical structure layer is greater than the refractive index of the second optical structure layer.

19. The method according to claim 18, characterized in that The method further comprises: A light-emitting blocking layer is formed, and the light-emitting blocking layer is etched to form a light-emitting opening.

20. A display device, characterized in that: The display device comprises the display panel according to any one of claims 1-15.

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